Policy signals embedded in the meeting indicate that the latest hike is not a one-off adjustment. According to the dot plot, 16 out of 18 Fed officials forecast one additional rate increase within 2026. Data from the CME FedWatch Tool quickly repriced market expectations: immediately after the release, the probability of another 25-basis-point hike before year-end climbed to 88%, up sharply from 66.3% recorded in the week prior to the meeting. The Fed revised several key wordings in its policy statement, removing the phrase “some inflation stems from energy supply shocks” retained in earlier documents and keeping only the core assessment that “inflation remains elevated”. References to geopolitical conflicts were generalised, with no separate mention of the Middle East situation. Regarding US domestic economic fundamentals, the Fed upgraded its growth forecasts for this year and next, while downgrading unemployment projections. It acknowledged that household consumption and private capital spending remain resilient, corporate credit conditions stay active, and current financial conditions have not delivered sufficient tightening effects, leaving room for further policy restraint. During the press conference, Chair Wash stressed that inflation is falling more slowly than initially anticipated. The Fed remains committed to returning inflation to its 2% long-run target and will refrain from premature monetary easing. All future rate adjustments will be dynamically assessed based on high-frequency economic indicators including CPI, PCE, employment and wages, with no pre-set path for rate hikes. Such hawkish remarks became the primary catalyst for the short-term rally in the US dollar after the meeting.
 

The foreign exchange market reacted instantly to the Fed’s hawkish decision. Right after the announcement, the US Dollar Index surged, touching 100.33 and hitting a six-week high. The core FX mechanism is straightforward: Fed rate hikes lift US risk-free yields and widen interest rate differentials between the United States and other economies. Capital tends to flow back into dollar-denominated assets and prop up the US dollar exchange rate. This is the key channel through which the US dollar, as the global reserve currency, transmits monetary policy shocks worldwide. Nevertheless, this round of market movement shows distinctive features compared with previous tightening cycles. Although the dollar jumped, its upward momentum faded, failing to sustain a unilateral sharp rally. Some currencies even rebounded, breaking the entrenched market assumption that “Fed rate hikes equal synchronous depreciation across all non-US currencies”.
 

Among major advanced-economy currencies, the euro and the yen moved divergently against the US dollar. Following the Fed meeting, the Bank of Japan announced a 25-basis-point rate increase on September 18, lifting its policy rate to 1.25%, the highest level in 31 years. The BOJ’s tightening partially offset yen depreciation pressure stemming from the widening US-Japan rate differential, stabilising the yen in sideways trading. The European Central Bank (ECB) has completed its prior round of rate hikes and entered a phase of economic assessment. The eurozone’s recovery lacks momentum, manufacturing stays sluggish and domestic demand remains weak, limiting the ECB’s scope for further rate increases. Expectations of widening US-euro rate spreads weighed on the euro, with EUR/USD trading under mild downward pressure. As for the British pound, the Bank of England kept its policy rate unchanged. While UK inflation has cooled, economic growth momentum is fragile, leaving policymakers in a bind. GBP traded within a range amid dollar volatility, and market participants adopted a wait-and-see stance.
 

Performance dispersion among emerging-market currencies became even more pronounced. Economies with heavy reliance on US dollar external debt, insufficient foreign exchange reserves and persistent current account deficits face direct impacts from the Fed’s renewed tightening. Higher dollar funding costs trigger cross-border capital outflows and depreciation pressure on local currencies. Import prices in domestic currency terms rise, potentially reviving imported inflation. Some Middle Eastern nations raised benchmark rates in lockstep with the Fed. The Hong Kong Monetary Authority also lifted rates by 25 basis points to 4.25% to maintain the linked exchange rate system and fend off capital outflows. In contrast, emerging-market currencies backed by solid fundamentals and ample foreign exchange reserves demonstrated resilience. Certain high-yield currencies edged higher on inflows from carry-trade capital. The renminbi charted an independent trajectory. Amid the external headwind of Fed rate hikes, both onshore and offshore USD/CNY broke below 6.70, reflecting renminbi appreciation. Market analysis attributes renminbi strength not to US-China rate differentials, but to sustained corporate foreign exchange sales and renminbi purchases, stabilising guidance via the central parity rate, optimism over domestic fundamental improvement and fading dollar bullish momentum. Moreover, China maintains independent monetary policy and does not need to adjust domestic interest rates passively in response to Fed hikes. The exchange rate is primarily determined by domestic economic fundamentals, balance of payments and market supply and demand, with its capacity to withstand external shocks continuously strengthened.
 

Supplementary details from the quarterly foreign exchange operations report released by the Federal Reserve Bank of New York show that neither the Fed nor the US Treasury conducted any official foreign exchange interventions in Q2 2026. The US dollar’s trade-weighted effective exchange rate moved in different directions across currency baskets: the dollar appreciated against advanced-economy currencies while depreciating against some emerging-market currencies. FX volatility was driven mainly by spontaneous market transactions rather than official intervention. The report also covered the Fed’s global dollar liquidity tools. The standing central bank swap lines and FIMA Repo Facility serve as a global safety net for dollar funding markets. In the event of liquidity crunches in cross-border dollar financing or abrupt FX market turbulence, these tools can alleviate offshore dollar shortages and stabilise the global foreign exchange and financial system. This framework forms one of the cornerstones of the US dollar-dominated global monetary system.
 

FX market fluctuations spilled over into US Treasuries and gold. After the policy release, short-term US Treasury yields rose notably, while gains in long-end yields were capped, flattening the Treasury yield curve further. The 2-year Treasury yield rose more than the 10-year yield. Markets price in persistently high short-term rates, yet long-term recession concerns cap long-dated bond yields. Spot gold is priced in US dollars, so dollar strength and rising real yields pressured bullion prices, triggering a temporary correction. That said, safe-haven buying linked to geopolitical conflicts cushioned gold’s downside.
 

Central banks across the globe have now entered a phase of divergent monetary policies, ending the multi-year period of synchronous global rate hikes or cuts. The Fed restarted tightening, the Bank of Japan is gradually exiting ultra-low rates, the ECB paused hikes to observe economic conditions, the Bank of England holds high rates and stays on hold, while certain Latin American economies such as Brazil continue cutting rates. Each central bank sets policies independently based on domestic inflation, employment and growth conditions, and interest rate differentials are constantly reshaped. This complicates FX trading logic, as Fed policy alone can no longer dictate movements in all currencies. Country-specific fundamentals, geopolitical risks, energy prices and cross-border capital flows jointly drive exchange rates.
 

Market institutions have warned about risks in foreign exchange trading. Fed officials will deliver a series of speeches after the blackout period ends, and markets will continue to extract policy signals from their remarks. Meanwhile, releases of US CPI, PCE inflation, nonfarm payrolls, retail sales and other economic indicators will repeatedly reshape Fed rate hike expectations and may trigger sharp swings in the US Dollar Index and non-US currencies. If US inflation rebounds and consumption remains robust, the Fed is highly likely to deliver the additional year-end hike, which would reinvigorate the dollar and intensify pressure on emerging-market currencies. Conversely, if the US economy cools rapidly and inflation decelerates faster, the current Fed hiking cycle may end here, limiting further upside for the dollar and opening room for non-US currencies to rebound. In addition, international crude oil prices remain at high levels, and uncertainties over geopolitical conflicts persist. Higher energy prices may rekindle global inflation expectations, disturbing Fed policy judgement and acting as a key external variable roiling FX markets.
 

For foreign trade enterprises and cross-border investors, exchange rate hedging has grown substantially more important amid high volatility. Trading firms need to track Fed policy developments and US Dollar Index movements continuously, optimise the timing of foreign exchange settlement and sales, deploy FX derivatives to hedge exchange rate risk and avoid profit erosion caused by abrupt short-term currency moves. Cross-border asset investors must monitor policy expectation differentials among major economies including the US, the eurozone and Japan, and stay alert to the risk of sudden FX market reversals triggered by shifting expectations. Overall, the Fed’s resumption of rate hikes kicks off a volatile second half for the global foreign exchange market. Interplay between the dollar cycle, diverging central bank policies, geopolitical risks and energy risks will sustain fierce battles in currency markets. Upcoming Fed official speeches and US key economic data releases all carry the potential to spark new market volatility.